package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.collection.ListUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.constant.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnums;
import com.yupi.yupicturebackend.model.vo.userVo.UserLoginVo;
import com.yupi.yupicturebackend.model.vo.userVo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
* @author Administrator
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-07-03 11:07:33
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号长度小于四位");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码长度小于八位");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "第一次和第二次输入密码不相等");
        }
        // 2.检查数据库中是否有重复账号
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        long count = count(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 3. 密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4. 插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("练习时长两年半的坤坤");
        user.setUserRole(UserRoleEnums.USER.getValue());
        boolean saveResult = save(user);
        if (!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败");
        }
        return user.getId();
    }

    @Override
    public UserLoginVo userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验
        if (StrUtil.hasBlank(userAccount, userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        //2.检查是否存在该账号
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        User user = this.getOne(queryWrapper);
        if (user == null) {
            log.info("用户不存在");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在");
        }
        //3.检查密码是否匹配
        String encryptPassword = getEncryptPassword(userPassword);
        if (!user.getUserPassword().equals(encryptPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
        }
        //4.保存用户登录态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        return getSafetyUser(user);
    }

    @Override
    public User getLoginInfo(HttpServletRequest request) {
        //1.判断当前用户登录状态
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //2.查询数据库看判断是否登录
        Long currentUserId = currentUser.getId();
        User user = this.getById(currentUserId);
        if (user == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    @Override
    public boolean UserLogout(HttpServletRequest request) {
        //1.判断当前是否登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //2.移除登录态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null){
           return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVoList(List<User> userList) {
        if (CollUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }


    public String getEncryptPassword(String userPassword) {
        String SALT = "changchengqichedasb";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnums.ADMIN.getValue().equals(user.getUserRole());
    }

    // 获取脱敏的用户信息
    public UserLoginVo getSafetyUser(User originUser) {
        if (originUser == null) {
            return null;
        }
        UserLoginVo userLoginVo = new UserLoginVo();
        BeanUtil.copyProperties(originUser, userLoginVo);
        return userLoginVo;
    }

}




